Question

我的android studio应用程序出现严重问题！

我创建了一个带有两个表的数据库。插入数据时会发生问题。事实上，当我在表单中插入数据时，前一个数据将被删除！

------------例如-------------------

首次插入：

名称 - ＆gt;一个
密码 - ＆gt;

第二次插入：
名称 - ＆gt; b
密码 - ＆gt; b

但第一次插入被取消了！

我希望有人帮助我...我会用一些代码来理解我的问题：

DatabaseOperation.java

private static final String CREATETABLE_QUERY_USER =
        "CREATE TABLE " + UserContact.DatabaseInfo.TABLE_USER + " ( "
                + UserContact.UserInfo.ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + UserContact.UserInfo.USERNAME + " TEXT NOT NULL, "
                + UserContact.UserInfo.PASSWORD + " TEXT NOT NULL, "
                + UserContact.UserInfo.EMAIL + " TEXT NOT NULL, "
                + UserContact.UserInfo.PHONE_NUMBER + " TEXT NOT NULL "
                + " );"
        ;

private static final String CREATETABLE_QUERY_PASSWORD =
        "CREATE TABLE " + UserContact.DatabaseInfo.TABLE_PASS + " ( "
                + UserContact.PasswordTable.ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                + UserContact.PasswordTable.NAME + " TEXT NOT NULL, "
                + UserContact.PasswordTable.POSTERPASSWORD + " INTEGER NOT NULL, "
                + UserContact.PasswordTable.DESCRIPTION + " TEXT NOT NULL, "
                + UserContact.PasswordTable.PASSWORD + " TEXT NOT NULL "
                //+ " FOREIGN KEY(" + UserContact.PasswordTable.ID + ") REFERENCES " + UserContact.DatabaseInfo.TABLE_USER + "(" + UserContact.UserInfo.ID +")
                + " );"
        ;
public void addUser(SQLiteDatabase db, String username, String password, String email, String phone){
    ContentValues contentValues = new ContentValues();
    contentValues.clear();
    contentValues.put(UserContact.UserInfo.USERNAME, username);
    contentValues.put(UserContact.UserInfo.PASSWORD, password);
    contentValues.put(UserContact.UserInfo.EMAIL, email);
    contentValues.put(UserContact.UserInfo.PHONE_NUMBER, phone);
    db.insert(UserContact.DatabaseInfo.TABLE_USER, null, contentValues);
}

public void addPassword(SQLiteDatabase db, String name, String note, String password, int posterpassword){

    ContentValues contentValues = new ContentValues();
    contentValues.clear();

    if(password.length() > 0){
        contentValues.put(UserContact.PasswordTable.POSTERPASSWORD, posterpassword);
        contentValues.put(UserContact.PasswordTable.NAME, name);
        contentValues.put(UserContact.PasswordTable.DESCRIPTION, note);
        contentValues.put(UserContact.PasswordTable.PASSWORD, password);

        db.insert(UserContact.DatabaseInfo.TABLE_PASS, null, contentValues);
        Log.e("DATABASE OPERATION", " INSERT PASSWORD successfull in " + UserContact.DatabaseInfo.TABLE_PASS + "...");
    }
}

NewContact.java

String name      = usernameEditText.getText().toString();
String password  = passwordEditText.getText().toString();
String mail      = emailEditText.getText().toString();
String phone     = phoneEditText.getText().toString();

//Add user to database
String dbFile = getDatabasePath(UserContact.DatabaseInfo.DB_NAME).getPath();
databaseOperations = new DatabaseOperations(context);
sqLiteDatabase = SQLiteDatabase.openOrCreateDatabase(dbFile, UserContact.DatabaseInfo.password, null);
sqLiteDatabase = databaseOperations.getWritableDatabase(UserContact.DatabaseInfo.password);
databaseOperations.addUser(sqLiteDatabase, name, password, mail, phone);
Log.e("New Contact: " , "Success! -> username: " + name + ", password: " + password);
//End to add user----------------------------------

//After registration, return to authentication page
Intent intent_authenticationPage = new Intent(getApplicationContext(), AuthenticationPage.class);
startActivity(intent_authenticationPage);

Answer 1

我没有获得您的数据库结构，但无论如何都尝试从

更改CREATE TABLE语法

CREATE TABLE <table_name>(...)

到

CREATE TABLE IF NOT EXISTS <table_name>(...)

在android数据库中插入行无法正常工作

1 个答案: